For a modern look take a peek at our selection of fire pit glass and rocks. Fire glass beautifully reflects flames off of its thousands and thousands of pieces. You'll find fire pit glass in hundred of colors, shapes, and sizes. If glass is not your style there are rocks that can fill that void in your fire pit. Fire Pit rocks are wonderful addition, strong and made to withstand the heat, these rocks are stunning. Maybe you can do both. A bed of rocks and a layer of glass on top.